Gas Heating and Formation of Single Linear Discharge Channel on Repetitive Branched Streamer Corona. Issue 2 (January 2015)

• Record Type: Journal Article
• Authors: Matsumoto, Takao; Kijima, Koji; Shimoju, Toshiharu; Inada, Yoichi; Izawa, Yasuji; Nishijima, Kiyoto
• Is Part Of: Electrical engineering in Japan. Volume 190:Issue 2(2015)
• Page Start: 10
• Page End: 16
• Publication Date: 2015-01
• Subjects: Electrical engineering -- Periodicals; 621.30952
• DOI: 10.1002/eej.22675
• Languages: English
• ISSNs: 0424-7760

Abstract

<abstract abstract-type="main"> <title>SUMMARY</title> <p>Under a nonuniform field in an atmospheric short gap, a branched pulse streamer corona changes to a single filamentary discharge (SFD) for a split second just before sparkover occurs. This SFD is a pretransitional phenomenon of sparkover. Therefore, it is very important to study SFD for an understanding of the sparkover mechanism. In this work, the SFD was recreated well by applying a highly repetitive impulse voltage to a needle‐plane gap in synthetic air with dilute CO₂. The characteristics of the SFD, including the channel temperature, the propagation of the streamer head, and the formation process, were investigated by means of an intensified charge coupled‐device (ICCD) camera and a spectroscopic measurement system. It was found that the transition to SFD progresses with localized gas heating along the discharge channel. Furthermore, it was revealed that the SFD is a nonbranched positive streamer.</p> </abstract>